Polyester film, preparation method thereof and method for reproducing polyethyleneterephthalate container using same

a polyethyleneterephthalate and polyethylene terephthalate technology, applied in the field of polyethylene terephthalate, can solve the problems of non-uniform shrinkage or distortion of plastic containers, and achieve the effects of improving thermal properties and chemical characteristics, easy control of crystallinity, and excellent shrinkage ra

Active Publication Date: 2022-07-28
SK MICROWORKS AMERICA INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]In the polyester film according to an embodiment, the melting enthalpy (ΔHm) satisfies 9 J / g or more as measured by differential scanning calorimetry, whereby it is possible to easily control the crystallinity thereof, resulting in improved thermal properties and chemical characteristics. Accordingly, the polyester film according to an embodiment not only has an excellent shrinkage rate with respect to temperature, but also has excellent adhesive strength by a solvent even when applied to gravure printing, UV curing printing, and variable sleeve offset printing (VSOP), making it suitable for a heat shrinkage process and a seaming process.
[0013]Alternatively, the polyester film according to an embodiment satisfies a melting point (Tm) of 190° C. to 230° C. when measured by differential scanning calorimetry and a peel strength of 150 gf / 3 cm or more, whereby it is possible to easily control the crystallinity thereof, resulting in improved thermal properties and chemical characteristics. Accordingly, the polyester film according to an embodiment not only has an excellent shrinkage rate with respect to temperature, but also has excellent adhesive strength by a solvent even when applied to gravure printing, UV curing printing, and variable sleeve offset printing (VSOP), making it suitable for a heat shrinkage process and a seaming process.
[0014]In addition, the polyester film has a low defect rate in the recycling process since the occurrence of clumping is suppressed in the thermal treatment process for a long period of time. Accordingly, it is possible to enhance the quality, yield, and productivity of the regenerated polyester chips produced through the regeneration process of a polyethylene terephthalate container using the polyester film.
[0015]Further, the process for regenerating a polyethylene terephthalate container according to the embodiment does not require a separate step of separating a container and a film. Thus, it is economical since time and cost are saved.

Problems solved by technology

However, since a conventional polyester film has a fast shrinkage speed and a high shrinkage stress, there have been defects caused by non-uniform shrinkage or distortions of a plastic container.
In addition, as concerns about environmental problems have increased in recent years, the recycling issues of products fabricated using thermoplastic polymers have become important.

Method used

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  • Polyester film, preparation method thereof and method for reproducing polyethyleneterephthalate container using same
  • Polyester film, preparation method thereof and method for reproducing polyethyleneterephthalate container using same
  • Polyester film, preparation method thereof and method for reproducing polyethyleneterephthalate container using same

Examples

Experimental program
Comparison scheme
Effect test

example 1-1

[0170](1) Preparation of a Copolymerized Polyester Resin

[0171]An autoclave (or first reactor) equipped with a stirrer and a distillation column was charged with 100% by mole of terephthalic acid (TPA) as a dicarboxylic acid and 75.6% by mole of ethylene glycol (EG), 18.8% by mole of neopentyl glycol (NPG), and 5.6% by mole of diethylene glycol (DEG) as a diol. 0.07 part by weight of manganese acetate as a transesterification catalyst was added per 100 parts by weight of the dicarboxylic acid, followed by heating the mixture to 220° C. and the removal of methanol produced as a byproduct to carry out the reaction.

[0172]Upon completion of the transesterification reaction, 0.07 part by weight of silica having an average particle diameter of 0.28 μm was added per 100 parts by weight of the dicarboxylic acid, and 0.4 part by weight of trimethyl phosphate as a stabilizer was added. After 5 minutes, 0.035 part by weight of antimony trioxide and 0.005 part by weight of tetrabutylene titanate...

examples 1-2 to 1-9

and Comparative Examples 1-1 to 1-9

[0176]Polyester films were prepared in the same manner as in Example 1-1, except that the contents of the dicarboxylic acid and the diol, the content of the homopolyethylene terephthalate, and the process conditions were changed as shown in Table 1 below.

[0177]The final components of the polyester films prepared in Examples 1-1 to 1-9 and Comparative Examples 1-1 to 1-9 are shown in Table 2 below.

TABLE 1HOMO-PETStretchingPreheatingHeat-setting(part byratiotemp.temp.weight)TDMD(° C.)(° C.)Ex. 1-1104.15—10575Ex. 1-234.15—10585Ex. 1-354.15—10590Ex. 1-454.15—10575Ex. 1-5104.15—10575Ex. 1-6204.15—10575Ex. 1-7204.5—11570Ex. 1-8104.15—10593Ex. 1-9304.15—10575C. Ex. 1-1—4.5—11570C. Ex. 1-2—4.5—11575C. Ex. 1-3—4.5—11585C. Ex. 1-4—4.5—11590C. Ex. 1-5404.15—10577C. Ex. 1-6604.15—10570C. Ex. 1-7804.15—10575C. Ex. 1-8—4.5—11575C. Ex. 1-9—4.5—11575

TABLE 2TPAEGNPGCHDMDEG(% by(% by(% by(% by(% bymole)mole)mole)mole)mole)Ex. 1-110078.017.0—5.0Ex. 1-210078.017.0—5.0...

example 2-1

[0195](1) Preparation of a Polyethylene Terephthalate Container Provided with a Polyester Film

[0196]FIG. 1 shows a polyester film applied to a product before and after heat shrinkage thereof. Referring to FIG. 1, a part of the outer surface of a polyethylene terephthalate container (PET container, 30 g) was wrapped with the polyester film prepared in Example 1-1 (see FIG. 1(a)). In such event, it was fixed using an acrylic adhesive. Thereafter, the polyester film of Example 1-1 was shrunk at a temperature of 90° C. under a hot air condition to obtain a polyethylene terephthalate container provided with a polyester film (see FIG. 1(b)).

[0197](2) Regeneration Process of a Polyethylene Terephthalate Container

[0198]The container provided with a polyester film prepared in step (1) was crushed with a crusher to obtain flakes. The flakes were first washed with water. Thereafter, the flakes were second washed for 15 minutes with a washing solution (a mixture of a solution of 0.3% by weight ...

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Abstract

The embodiments relate to a polyester film, to a process for preparing the same, and to a process for regenerating a polyethylene terephthalate (PET) container using the same. The polyester film has excellent seaming characteristics and recyclability by virtue of controlled crystallinity, whereby clumping rarely occurs even if it is thermally treated for a long period of time in the regeneration process.

Description

TECHNICAL FIELD[0001]Embodiments relate to a polyester film, to a process for preparing the same, and to a process for regenerating a polyethylene terephthalate container using the same. Specifically, the embodiments relate to a polyester film having excellent seaming characteristics and recyclability by virtue of controlled crystallinity, to a process for preparing the same, and to a process for regenerating a polyethylene terephthalate (PET) container provided with such a polyester film.BACKGROUND ART[0002]In recent years, as containers for beverages or foods are manufactured in various forms, or there are increased cases in which full packaging is applied in order to attract the attention of consumers, heat shrinkable labels and packaging materials are attracting attention. Such a heat shrinkable label or packaging material takes advantage of the feature of a polymer film that tends to shrink to a shape before stretching thereof at a certain temperature or higher once it has been...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08J5/18C08G63/183B29C55/00B29B9/16B29B9/04
CPCC08J5/18C08G63/183B29C55/005B29K2067/003B29B9/04C08J2367/03B29B9/16C08L67/03B29B17/0052C08J2367/02C08J2467/02C08G63/672C08L67/02C08J11/06B29B17/0026B29B2017/0468B29B17/0412B29L2031/712B29L2031/744Y02W30/62
Inventor YANG, JOO HOKIM, CHUL KYUKIM, YONG DEUK
Owner SK MICROWORKS AMERICA INC
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